19866850681333 has 4 divisors (see below), whose sum is σ = 19866930264928. Its totient is φ = 19866771097740.

The previous prime is 19866850681309. The next prime is 19866850681361. The reversal of 19866850681333 is 33318605866891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19866850681333 - 2⁹ = 19866850680821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19866850681393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39416163 + ... + 39917008.

It is an arithmetic number, because the mean of its divisors is an integer number (4966732566232).

Almost surely, 2^{19866850681333} is an apocalyptic number.

It is an amenable number.

19866850681333 is a deficient number, since it is larger than the sum of its proper divisors (79583595).

19866850681333 is an equidigital number, since it uses as much as digits as its factorization.

19866850681333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79583594.

The product of its (nonzero) digits is 134369280, while the sum is 67.

The spelling of 19866850681333 in words is "nineteen trillion, eight hundred sixty-six billion, eight hundred fifty million, six hundred eighty-one thousand, three hundred thirty-three".